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The CBOE Volatility Index climbed 0.9 points to close at 15.1 last week, snapping out of a drift toward year-to-date lows as the S&P 500 shed 1.4%. The catalyst wasn’t a single dramatic event but a slow-burning cocktail: surging long-term Treasury yields, a government scramble to stabilize the bond market, and options traders quietly loading up on downside protection ahead of Nvidia’s next earnings report.
Treasury yields hit levels not seen since 2007
The 30-year Treasury yield surged to 5.33% intraweek, its highest reading since 2007. Treasury Secretary Bessent responded by announcing a doubling of the Treasury’s bond buyback program to $4 billion.
The MOVE Index, which measures implied volatility in the Treasury market the same way the VIX measures it for equities, rose to 73, landing in the 54th percentile. Meanwhile, the VXTLT 20-Year Bond Volatility Index jumped from the 13th to the 32nd percentile in a single week.
Nvidia options tilt bearish ahead of August earnings
Nvidia reports earnings on August 26. Options pricing implies traders expect a move of roughly 6.5% to 7% around the event. Put skew has steepened, meaning the cost of protecting against downside moves has risen relative to the cost of betting on upside.
What’s really happening inside the VIX
Short iron-fly positioning, a strategy where traders sell both calls and puts at the same strike price while buying further out-of-the-money options, has been suppressing at-the-money implied volatility while elevating the wings. This means the VIX, which is heavily influenced by at-the-money options, may be understating the actual level of anxiety priced into more extreme scenarios.
What to watch from here
Bessent’s buyback intervention is a double-edged signal. On one hand, it demonstrates that policymakers are watching the bond market closely and willing to act. On the other, the fact that intervention was deemed necessary at all speaks to an underlying fragility in the Treasury market that hasn’t been fully resolved.
The structural suppression of VIX by iron-fly positioning means that a sudden unwind of those trades could cause the index to spike faster than the underlying market move would normally warrant.
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